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The Scientific World Journal
Volume 2014, Article ID 209584, 10 pages
http://dx.doi.org/10.1155/2014/209584
Research Article

Strength and Durability Performance of Alkali-Activated Rice Husk Ash Geopolymer Mortar

1Department of Civil Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea
2Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute, Karaikudi, India
3Department of Civil Engineering, Hannam University, Daejeon 306-791, Republic of Korea

Received 2 July 2014; Revised 18 September 2014; Accepted 19 September 2014; Published 23 November 2014

Academic Editor: Yinghai Wu

Copyright © 2014 Yun Yong Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper describes the experimental investigation carried out to develop the geopolymer concrete based on alkali-activated rice husk ash (RHA) by sodium hydroxide with sodium silicate. Effect on method of curing and concentration of NaOH on compressive strength as well as the optimum mix proportion of geopolymer mortar was investigated. It is possible to achieve compressive strengths of 31 N/mm2 and 45 N/mm2, respectively for the 10 M alkali-activated geopolymer mortar after 7 and 28 days of casting when cured for 24 hours at 60°C. Results indicated that the increase in curing period and concentration of alkali activator increased the compressive strength. Durability studies were carried out in acid and sulfate media such as H2SO4, HCl, Na2SO4, and MgSO4 environments and found that geopolymer concrete showed very less weight loss when compared to steam-cured mortar specimens. In addition, fluorescent optical microscopy and X-ray diffraction (XRD) studies have shown the formation of new peaks and enhanced the polymerization reaction which is responsible for strength development and hence RHA has great potential as a substitute for ordinary Portland cement concrete.